19988369 has 2 divisors, whose sum is σ = 19988370. Its totient is φ = 19988368.

The previous prime is 19988363. The next prime is 19988377. The reversal of 19988369 is 96388991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 4464769 = 3940^2 + 2113^2 .

It is a cyclic number.

It is not a de Polignac number, because 19988369 - 2¹² = 19984273 is a prime.

It is a super-2 number, since 2×19988369² = 799069790560322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19988369.

It is not a weakly prime, because it can be changed into another prime (19988363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994184 + 9994185.

It is an arithmetic number, because the mean of its divisors is an integer number (9994185).

Almost surely, 2^19988369 is an apocalyptic number.

It is an amenable number.

19988369 is a deficient number, since it is larger than the sum of its proper divisors (1).

19988369 is an equidigital number, since it uses as much as digits as its factorization.

19988369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 53.

The square root of 19988369 is about 4470.8353805525. The cubic root of 19988369 is about 271.3891324705.

The spelling of 19988369 in words is "nineteen million, nine hundred eighty-eight thousand, three hundred sixty-nine".